When you choose an issue to view inside the KMR, the web server creates a session
between itself and your computer in which the KMR "remembers" which issue you are reading.
The issue code is not located in the address bar for each page because the session already knows this.

If you copy a URL that does not contain the issue code, that URL will likely result in a Page Not Found because the
visitor who uses your link will not have a session in existence when they visit that link.
The KMR will not know which issue they were trying to access.
This is solved by including the issue code in the full URL.
The issue code tells the KMR which issue the viewer would like to access, and a new session is then created for that visitor.

The KMR website keeps track of the session for every visitor for approximately 60 minutes.
This way if you leave the KMR for a few minutes and come back, the KMR will remember which issue you were just reading.